Review Questions
4. For an element to be regarded as essential, all of the following criteria must be met, except:
- No other element can perform the function.
- The element is directly involved in plant nutrition.
- The element is inorganic.
- The plant cannot complete its lifecycle without the element.
5. The nutrient that is part of carbohydrates, proteins, and nucleic acids, and that forms biomolecules, is ________.
- nitrogen
- carbon
- magnesium
- iron
6. Most ________ are necessary for enzyme function.
- micronutrients
- macronutrients
- biomolecules
- essential nutrients
7. What is the main water source for land plants?
- rain
- soil
- biomolecules
- essential nutrients
8. Which factors affect soil quality?
- chemical composition
- history of the soil
- presence of living organisms and topography
- all of the above
9. Soil particles that are 0.1 to 2 mm in diameter are called ________.
- sand
- silt
- clay
- loam
10. A soil consists of layers called ________ that taken together are called a ________.
- soil profiles : horizon
- horizons : soil profile
- horizons : humus
- humus : soil profile
11. What is the term used to describe the solid rock that lies beneath the soil?
- sand
- bedrock
- clay
- loam
12. Which process produces an inorganic compound that plants can easily use?
- photosynthesis
- nitrogen fixation
- mycorrhization
- Calvin cycle
13. Through mycorrhization, a plant obtains important nutrients such as ________.
- phosphorus, zinc, and copper
- phosphorus, zinc, and calcium
- nickel, calcium, and zinc
- all of the above
14. What term describes a plant that requires nutrition from a living host plant?
- parasite
- saprophyte
- epiphyte
- insectivorous
15. What is the term for the symbiotic association between fungi and cyanobacteria?
- lichen
- mycorrhizae
- epiphyte
- nitrogen-fixing nodule